3,394 search results
Manual metal arc welding (MMA)
Science, Maths & Technology

Manual metal arc welding (MMA)

...open-circuit voltages of 50–100 V. Power sources range from 30 to 500 Amps a.c. or d.c. Coated electrodes contain slag-forming ingredients (that produce a fluid coating over the weld as it cools) and gas-forming ingredients (that generate atmospheres of CO2, CO or H2 around the arc). Principal materials used in electrode coatings include: Carbonaceous material of the...
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Article 10 mins
Studying Darwin
Nature & Environment

Studying Darwin

...Source: Natural History Museum All other material within this course originated at The Open University. Course image: Nishanth Joisin Flickr made available under Creative Commons Attribution 2.0 Licence. Don't miss out: If reading this text has inspired you to learn more, you may be interested in joining the millions of people who discover our free learning resources and...
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Level 1: Introductory 1 hr
Putting algae and seaweed on the menu could help save our seafood
Science, Maths & Technology

Putting algae and seaweed on the menu could help save our seafood

...source of food. Seaweed, for example, is a type of algae that has been eaten for centuries, but only 35 countries commercially harvest it today. Spirulina cyanobacteria is already eaten as a food supplement and several companies are trying to turn other forms of algae into a human food source. Farming these organisms in the right way could even help counter some of the...
View article Putting algae and seaweed on the menu could help save our seafood
Article 10 mins
Tackling juror trauma and stress
Society, Politics & Law

Tackling juror trauma and stress

...Open University's Law courses. [A stressed woman, leaning against a wall.] It goes without saying that being a juror can be stressful, particularly in offence against the person cases where jurors may be subjected to a range of graphic imagery depicting injury and death. Added to this, recent technological advances in 3D printing processes allow jurors to examine highly...
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Article 5 mins
Why riot? Community, choices, aspirations
Education & Development

Why riot? Community, choices, aspirations

...sources for permission to reproduce material in this free course: Time to Think Logo: © The Open University Figures Figure 1: courtesy: © Hugh Pollock 2021 (Highgrove Media) Figures 2, 7: Artwork: © The Open University Figure 3: Christian Horz/Alamy Stock Photo Figure 4: Rudzhan Nagiev/Getty Images/iStock Figure 5: Courtesy: Gabi Kent Figure 6. 9, 11, 13: © The Open...
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Level 1: Introductory 12 hrs
Building the first Thames sewer system
Science, Maths & Technology

Building the first Thames sewer system

...open - the great silent highway which bathes the terrace upon which stands the Legislative Palace, and so peculiarly fashioned that it retains the filth it receives for days. Fancy an open sewer stirred up twice a day by some powerful mechanism, and we have the Thames as altered by well-intentioned but blind sanitary zeal. And for three years more, at the least, we must...
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Article 10 mins
Five ways in which COVID-19 has impacted on progress in global health
Health, Sports & Psychology

Five ways in which COVID-19 has impacted on progress in global health

...Source: STATCOMPILER tables Due to COVID-19 several countries have witnessed a fall in institutional deliveries. This is mainly due to government and community health workers increased focus on COVID-19 related activities, including testing and tracing, in addition to provision of health care and recording of COVID-19 related activities. Ambulance (and other) services...
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Article 15 mins
Helen Langdon's ‘Caravaggio’
History & The Arts

Helen Langdon's ‘Caravaggio’

...opening their doors to scholars, and the history of art as a discipline accepting a wider range of sources. Part of Caravaggio's attraction for his contemporary biographers and for modern art historians is precisely the mix of art and artist that Hibbard highlights in his analysis of The Martyrdom of St Matthew. Leoni's portrait of Caravaggio is the first illustration in...
View course Helen Langdon's ‘Caravaggio’
Level 3: Advanced 20 hrs